github.com/google/trillian-examples@v0.0.0-20240520080811-0d40d35cef0e/binary_transparency/firmware/cmd/emulator/dummy/dummy_emu.go (about)

     1  // Copyright 2020 Google LLC. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // dummy_emu is an "emulator" for the dummy device.
    16  //
    17  // This emulator shows how the firmware transparency artifacts stored
    18  // when firmware is updates are validated on boot to protect the device against
    19  // tampering.
    20  //
    21  // The device's initialisation routines in "ROM" are where this validation
    22  // takes place, and the device only "jumps into" the firmware payload once
    23  // successful validation has taken place.
    24  //
    25  // Usage:
    26  //
    27  //	go run ./cmd/emulator/dummy --logtostderr --dummy_storage_dir=/tmp/dummy_device
    28  package main
    29  
    30  import (
    31  	"flag"
    32  
    33  	"github.com/golang/glog"
    34  	"github.com/google/trillian-examples/binary_transparency/firmware/cmd/emulator/dummy/impl"
    35  )
    36  
    37  var (
    38  	dummyDirectory = flag.String("dummy_storage_dir", "/tmp/dummy_device", "Directory path of the dummy device's state storage")
    39  )
    40  
    41  func main() {
    42  	flag.Parse()
    43  
    44  	if err := impl.Main(impl.EmulatorOpts{
    45  		DeviceStorage: *dummyDirectory,
    46  	}); err != nil {
    47  		glog.Exit(err.Error())
    48  	}
    49  }